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The missing elements that Mendeleev predicted in his periodic table were germanium, gallium, and scandium. Mendeleev left gaps in the table for these elements based on the patterns he observed in the known elements at the time.
Dmitry I. Mendeleyev
Dmitry Ivanovich Mendeleyev
Leaving spaces and gaps in the periodic table allowed for prediction of new elements and their properties, which were later discovered and filled in. This vindicated the decision to leave gaps, as it demonstrated the power of the periodic table in organizing and predicting the properties of elements.
True--PainRain
There were gaps in the periodic table a hundred years ago because investigators had not discovered some elements yet, though there was a "place" for them in the array. Recall that through the genius of Mendeleyev, the elements had been given an "order" owing to their chemical properties. By creating a "chart" (the first periodic table), Mendeleyev could see where elements "would be" though none had yet been discovered. He could predict that eventually an element would appear "here" on the table and would have a "these" properties because of the arrangements in the array or table of element.
The missing elements that Mendeleev predicted in his periodic table were germanium, gallium, and scandium. Mendeleev left gaps in the table for these elements based on the patterns he observed in the known elements at the time.
The periodic table
Dmitry I. Mendeleyev
The Periodic Table was invented by Dmitry Mendeleyev. He grouped every known element and he used this table to predict the existence of other several elements. Mendelevium name pays homage to Dmitry Mendeleyev.
Dmitry Ivanovich Mendeleyev
Russian chemist Dimitri Mendeleyev.
Leaving spaces and gaps in the periodic table allowed for prediction of new elements and their properties, which were later discovered and filled in. This vindicated the decision to leave gaps, as it demonstrated the power of the periodic table in organizing and predicting the properties of elements.
A secondary phenomenon is knowing something that we did not acquire through knowledge or research.The Russian chemist Dmitri Ivanovich Mendeleev (Dmitry Mendeleyev 1834-1907) had a secondary phenomenon. "In one moment - I know." Mendeleyev developed The Periodic Law based on a vision in a dream. In his dream, he saw elements arranged according to their chemical properties and atomic weight. Dmitry did not see all the elements in his vision. Dmitry Mendeleyev documented the elements that he saw in his Periodic Tableand published it with gaps for elements that were not known at the time. The gaps where filled in years later as they were discovered by other scientist.
Mendeleev organized the periodic table of elements by increasing atomic mass and grouping elements with similar properties together. He left gaps in the table for undiscovered elements and predicted their properties based on the pattern of known elements.
The gaps in Mendeleev's periodic table suggested the existence of undiscovered elements that would fit into the missing slots. This helped scientists predict the properties of these elements, aiding in their discovery. The periodic table's layout allowed for the systematic arrangement of elements based on their properties, making it easier for scientists to identify patterns and make predictions about unknown elements.
There were about 63 known elements.